Any Explanation for Random Reset of Screen Resolution?

M

MaxBuck

Member
OK, so my latest problem relates to Parallels randomly and unpredictably changing the screen resolution of my virtual machine between the time I minimize the VM window to my OSX dock and the time I restore the VM window to resume work. It's merely a nuisance if all it does is change the resolution to one that causes the working screen to exceed the size of my display screen (which means I need to navigate around my screen using scroll bars); I can fix that in my Vista control panel. But when it changes to an invalid resolution (which it just did), my VM screen is just a mess of colored snow and chevrons, and I have to exit the VM entirely and reboot.

Any ideas from the forum on how to fix this? Running Build 9308, Vista Home Premium on a MacBook Pro 2.66 GHz with 4GB of RAM.
 
Quick follow-up: proper re-loading of Parallels Tools required it first to be Uninstalled using the appropriate Control Panel mechanism in Vista. After re-installing Tools, everything now appears to work well again.

Not clear on how Tools is getting corrupted from time to time.
 
Happening again

When I transition from full screen to window view, then back to full screen, the screen resolution resets to the maximum possible - which my MacBook Pro is incapable of displaying. So the screen displays only part of the "desktop," and I have scroll bars at side and bottom of my Vista screen.

How to solve this? Parallels Tools appears now to be properly installed. Note the new "upgrade" to Parallels just installed, which is probably the source of this mess.
 
I find that the Parallels Coherence Service doesn't work all that well when the VM is set to adapt the host's screen resolution to its own resolution. IE if you're running Parallels in your machine's native resolution, say 1280 by 800, and then some program running within the VM sets the screen to say 800 by 600, and after a while you'll quit that program, the screen resolution stays at 800 by 600. I prevented the Parallels Tools services and the Parallels Coherence services from loading in Windows (using msconfig) and that problem has gone away.
 
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